MCQ Range of Hearing and Ultrasound Chapter 11 Class 9 Science Advertisement MCQ’s For All Chapters – Science Class 9th 1. The audible range of sound for human beings is2 Hz – 200 Hz20 Hz – 20000 Hz200 Hz – 200000 Hz2000 Hz – 20000 HzQuestion 1 of 202. Sounds of frequency below 20 Hz are calledUltrasoundInfrasoundHypersoundSupersonic soundQuestion 2 of 203. Sounds of frequency above 20000 Hz are calledAudible soundInfrasonic soundUltrasonic soundResonant soundQuestion 3 of 204. Which animal can hear sounds up to 25 kHz?HumanDogElephantWhaleQuestion 4 of 205. As people grow older, their ears becomeMore sensitive to higher frequenciesLess sensitive to higher frequenciesMore sensitive to lower frequenciesEqually sensitive to all frequenciesQuestion 5 of 206. Which animals communicate using infrasound?Dolphins and batsWhales and elephantsCats and ratsBirds and beesQuestion 6 of 207. Before earthquakes, some animals get disturbed becauseThey sense high-frequency wavesThey sense infrasound produced by earth movementsThey feel heat changesThey sense magnetic fieldsQuestion 7 of 208. The vibrations of a pendulum fall under which sound category?Audible soundInfrasoundUltrasoundMechanical noiseQuestion 8 of 209. Ultrasound is produced byHumansBats and dolphinsSnakesCowsQuestion 9 of 2010. Moths can detect bats becauseThey produce louder soundThey sense ultrasonic squeaks of batsThey are faster flyersThey reflect bat wavesQuestion 10 of 2011. The hearing aid converts sound waves intoLight signalsElectrical signalsHeat signalsMagnetic wavesQuestion 11 of 2012. The amplified electrical signals in a hearing aid are sent toSpeakerEar canal directlyBatteryReceiver antennaQuestion 12 of 2013. Ultrasound is used for cleaning becauseIt produces heatIt vibrates particles at high frequency, removing dirtIt dissolves materialsIt changes chemical structureQuestion 13 of 2014. Ultrasound can detect cracks in metal blocks becauseIt passes through only metalsIt gets reflected by defects inside the metalIt melts the metalIt is visible as lightQuestion 14 of 2015. Ordinary sound waves cannot be used to detect defects becauseTheir wavelength is too longThey travel too fastThey do not reflectThey absorb into the metalQuestion 15 of 2016. The technique of forming images of the heart using ultrasound is calledEcholocationEchocardiographyElectrocardiogramSonochemistryQuestion 16 of 2017. Ultrasonography is used toView external woundsGet images of internal organsMeasure temperatureDetect magnetic fieldsQuestion 17 of 2018. During ultrasonography, ultrasonic waves are reflected fromBones onlyRegions of tissue density changeAir layersSkin surface onlyQuestion 18 of 2019. Ultrasonography is used during pregnancy toIncrease baby’s growthDetect congenital defects and growth abnormalitiesProduce X-raysChange tissue densityQuestion 19 of 2020. Ultrasound can be used to break kidney stones becauseIt produces heat that melts stonesIt produces shock waves that crush stones into fine grainsIt dissolves stones chemicallyIt vibrates the bladderQuestion 20 of 20 Loading...
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